"Bill Carpenter" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Thanks Gary, I'll look at the AC-4 though I replaced the electrolytics a few
years ago. Which pin is the bias measured on? It looks like pin 9 to me
at -45 to -65 volts against pin 1 which is ground?
----- Original Message -----
From: "Garey Barrell" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, January 01, 2008 9:46 AM
Subject: Re: [drakelist] T4B Trouble
Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist
gang
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Bill -
Sounds like you lost the bias supply in the AC-4, electrolytics and/or
rectifiers. There has been some discussion of this over the last few
weeks on here.
The AC-4R kit from The Heathkit Shop is the best answer for AC-4's that
still have their original electrolytics.
You got lucky in that the cathode resistors opened! Carbon comp resistors
are pretty hard to find. Best replacement is the Ohmite OX ceramic
composition resistor available from Mouser and others.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B & C-Line Service Supplement CDs
<www.k4oah.com>
Bill Carpenter wrote:
"Bill Carpenter" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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I was enjoying SKN last night on 40M with my Bline but decided to switch
to my K2/100 to use a more effective NB against bad powerline noise that
has popped up here recently. I left the Bline on and was happily CWing
away when the Bline kind of "blinked" so I turned it off. Later I found
no output at all so suspecting finals I checked them and yes they were
bad. I put good ones in and still no output. There had been no noise,
smoke or burned sound so I had not looked under the finals. I did that
this morning and found R32 and R33 (1 watt 15 Ohm) both burnt and testing
very high or open. Obviously I need to replace these but is there
anything else I should check first to see what may have caused this to
happen?
Any help appreciated.
Happy New Year! 73
Bill
NZ0T
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